You said it "is only an end to something if EVERYONE uses it" implying that since not everyone uses mobileme it's not ending/ won't be noticed I am not sure. However....

I said an end to something is an end to something quantity of users has nothing to do with it. Whether there are 1,000,000,000,000,000 users or just one using widget 'A' if the manufacturer of widget 'A' discontinues it, it has reached its "end"